Effects of Polypropylene Fibers and Measurement Methods on the Yield Stress of Grouts for the Consolidation of Heritage Masonry Walls

Baltazar, Luís G.; Henriques, Fernando; Cidade, M. T.

doi:10.3390/fluids5020053

Cited by 7 publications

(6 citation statements)

References 40 publications

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“…The result of the mortar test supports the finding of some other studies where the addition of polypropylene fiber can increase the quality of the mortar and reinforced concrete [24]- [28]. Polypropylene fiber can increase the mortar and reinforced concrete properties towards dynamic load [29], [30][31], [32].…”

Section: A Compressive Strengthsupporting

confidence: 83%

“…The maximum deflection was seen reaching 20.49 mm for DBPP with a maximum load of 8.27 kN. Some previous studies of strengthening of masonry brick that uses polypropylene material have shown an improvement of masonry properties also [8], [32], [34]- [36]. As mortar or concrete can endure high temperatures [37], the addition of polypropylene can increase the capacity of mortar or concrete with polypropylene towards temperature load [38].…”

Section: B Flexural Strengthmentioning

confidence: 99%

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Experimental Study of Masonry Wall Strengthened by Polypropylene Fiber Mortar

Melinda¹,

Juliafad²

2022

International Journal on Advanced Science, Engineering and Information Technology

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Based on previous studies, the average strength of Indonesia's masonry wall shows a weak compressive strength that increases the vulnerability of buildings with masonry walls towards the seismic load. This study presents an experimental investigation of the masonry wall's flexural capacity strengthened with Polypropylene Fiber (PP Fiber). In general, the experiments were divided into two groups: the masonry wall with PP Fiber in a joint mortar and the masonry wall with PP Fiber in a plastering. The investigation was carried out on twelve specimens. The specimens consisted of three standard masonry wall (DBK) samples as the controlled specimens, which are without plastering and PP Fiber, three masonry wall samples with PP Fiber (DBP) in a joint mortar, three masonry wall samples with normal plastering (DBKP), and three masonry wall samples with PP Fiber in a joint mortar and plastering (DBPP). The experimental investigation proved that the addition of PP Fiber to the mortar mixture at joint masonry mortar could increase the masonry wall's flexural capacity. The results showed that the mortar with 8% PP Fiber improves the compressive strength by 58.46%. The flexural testing showed that 8% PP Fiber to the mortar could increase the flexural capacity to 35.8%. The maximum deflection also increases as much as 38.58% for masonry walls with PP Fiber on mortar and plastering, compared to the masonry wall without PP Fiber. In addition, the presence of Polypropylene Fiber contributes to give a higher flexural capacity.

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Section: A Compressive Strengthsupporting

confidence: 83%

Section: B Flexural Strengthmentioning

confidence: 99%

Experimental Study of Masonry Wall Strengthened by Polypropylene Fiber Mortar

Melinda¹,

Juliafad²

2022

International Journal on Advanced Science, Engineering and Information Technology

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“…[8,9]. Most scholars in the industry [10][11][12][13][14] believe that there is an optimal dosage of retarder, and its type also has a great impact on the quantitative and mechanical indexes of grouting. Relevant researches have also obtained some important conclusions on the effects of inorganic and organic retarders on the properties of grouting materials.…”

Section: Introductionmentioning

confidence: 99%

Performance of the Cement Grouting Material and Optimization of the Mix Proportion for the Free Section of the Prestressed Anchor Bar

Wu,

Chen,

Zhang

et al. 2023

Materials

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Increasing the water–cement ratio and water-reducer dosage of cement slurry enhances its fluidity. However, a high water–cement ratio diminishes the beneficial effects of water reducers on fluidity. The stone content of the slurry decreases as the water-reducer dosage increases. Additionally, the water–cement ratio significantly affects stone content. However, when the water–cement ratio exceeds a threshold value, stone content decreases. Furthermore, the threshold value of the water–cement ratio decreases with increasing water-reducer dosage. Without the addition of the water reducer, as the water–cement ratio increases the overall integrity of the grout stone decreases. The addition of the water reducer alters the surface pore distribution, wherein “uniform small pores” change to “localized large pores.” Based on the multi-objective optimization of Matlab, the recommended optimal mix composition for a slow-setting cement slurry is a water–cement ratio of 0.25 and water-reducer dosage of 1.5%. With the use of this optimized mix composition, the stone content and compressive strength increase by 7.8% and 145.6%, respectively, compared to those obtained using the recommended mix ratio in the specifications. Additionally, all relevant performance parameters meet the requirements specified by previous standards.

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“…The Special Issue "Advances in Experimental and Computational Rheology, Volume II" comprises 10 papers covering some of the latest advances in the fields of experimental and computational rheology, applied to a diverse class of materials and processes, which can be grouped into three main topics: rheology [1][2][3][4][5], rheometry and processing [6,7], and theoretical modeling [8][9][10].…”

mentioning

confidence: 99%

“…The characterization of rheological behavior is the main topic of five contributions, covering the following materials/systems: S-aureus cultures (Portela et al [1]), in which antibiotic activity was screened by rheometry; natural hydraulic lime grouts filled with polypropylene fibers (Baltazar et al [2]), with a particular focus on the effect of the measurement methods on the obtained yield stress; wheat flour dough (Macedo et al [3]), where rheology was used as a tool to study the impact of whey powder addition on the dough and breadmaking performance; human milk (Alatalo et al [4]), covering the influence of external factors on its characteristics; and graphene oxide/poly(ethylene glycol) suspensions (Soares et al [5]), where the authors studied the influence of the oxidation degree of graphene oxide on the suspensions' shear rheology.…”

mentioning

confidence: 99%